WASHINGTON - When it comes to the presidency, the Republican Party has a long tradition of nominating the next guy in line. That's John McCain - and the failed GOP presidential aspirant of 2000 is positioning himself as the anointed 2008 nominee. Yet, a full year before the first primary contests, the Republican race is anything but wrapped up. The Arizona senator who once reveled in his reputation for bucking the party line is now running as the establishment candidate, but he faces serious challenges from Massachusetts Gov. Mitt Romney and former New York City Mayor Rudy Giuliani. "Right now,...